Adjusting mechanism for screw-threaded needle-point insertions of compasses.



No. 808,644. PATENTED JAN. 2, 1906.

J. EIOHMULLER. ADJUSTING MECHANISM FOR SCREW THREADED NEEDLE POINT INSERTIONS OP COMPASSES.

APPLICATION FILED APR.11.1905.

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UNITED STATES PATENT OFFICE.

JOHANN EICHMIILLER, OF NUREMBERG, GERMANY, ASSIGNOR TO THE FIRM OF EUGENE DIETZGEN (10., OF NEW YORK, N. Y.

Specification of Letters Patent.

Patented Jan. 2, 1906.

Application filed April 11, 1905. Serial No. 255,027.

To all whom, it may concern.-

Be it known that I, J OHANN EIoHMI'iLLER, manufacturer, a subject of the German Emperor, residing at Nuremberg, Bavaria, Germany, have invented new and useful Improvements in Adjusting Mechanisms for Screw-Threaded Needle-Point Insertions of Compasses, of which the following is a specification.

This invention has for its object a fine-adjusting mechanism for screw-threaded needle-point insertions for compasses in which the nut mounted on the needle is made diskshaped and secured against axial displacement by being inserted in a recess corresponding in width to the thickness of the disk in the foot of the needlepoint, arranged at right angles to the needle-foot of the leg of the compasses.

This improved fine-adjusting mechanism is shown in one form of construction in the accompanying drawings.

Figure 1 is an elevation; Fig. 2, an elevation turned at right angles to the previous view, and Fig. 3 a vertical section further again turned at right angles to Fig. 2.

The needle-foot a of the leg I) of the compasses is provided with a smooth perforation d, adapted to receive the needle 0, which perforation is continued on the inside of the compass-leg b as a semicylindrical groove e. A milled dlsk f is mounted in a recess 9, formed at ri ht an les to the axis of the needle, the widt of w 'ch recess corresponds to the thickness of the disk f, so that the latter cannot be axially displaced. On one side of the needle-foot a a stirrup-shaped enlargement h, surrounding the recess g, is provided,

in the yoke of which enlargement a pressurescrew 'i, adapted to be adjusted against the edge of the disk-shaped nut f is mounted. The insertion-needle c is also provided with a longitudinal groove 70, in which a small screw l, arranged on the needle-foot a, engages, and thereby prevents the needle revolving.

If the pressure-disk 'i be released, the needle which is prevented rotating is axially displaced in one direction or the other by the disk f being turned in one or other direction. In order to fix the needle in the desired position, it is only necessary to press the pressure-screw i against the edge of the disk f, which is thereby secured against rotation and in this manner prevents any unintentional displacement of the needle.

I declare that what I claim is- 1. In combination in a compass having a needle-foot having a longitudinal bore therein, a screw-threaded needle adapted to fit in said bore, said foot having a lateral recess therein, a disk fitting in said recess and having a screw-threaded central opening through which the needle passes, and means for preventing the needle from rotating when the disk is turned, substantially as described.

2. In combination in a compass having a needle-foot provided with a smooth longitudinal bore, a screw-threaded needle fitting in said bore, said needle having a longitudinal recess therein, a screw in said foot having its end engaging in said recess so as to prevent the needle from turning, said foot having a lateral recess and a disk fitting in said recess and having a central screw-threaded hole through which the needle passes.

3. In combination in a compass having a needle-foot provided with a smooth longitudinal bore, a screw-threaded needle fitting in said bore, means for preventing the needle from rotating, said foot having a lateral recess, a disk fitting in said recess and having a central screw-threaded hole through which said needle passes, a stirrup-shaped enlargement connected to the needle-foot and 1nclosing on one side the said recess and a pressure-screw mounted in said enlargement and having its end adapted to engage with the disk so as to prevent movement of the same.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

.IOHANN EIOHMIILLER. 

